69 



GENUS SCHISTOCERCA, STAL. 



TABLE FOR SEPARATING THE SPECIES. 



A. Antenna? of male nearly or quite one-half longer than head and pro- 

 notnui together. The latter angulate l)ehlnd. Lower edge of 

 sides of pronotum and costal edge of tegniina light yellow-testa- 

 ceous. " tlavotiijsciata DeGeer. 

 AA. Antenna' of male about one-fourth longer than the head and pro- 

 notum together. The latter more or Jess distinctly rounded be- 

 hind, 

 b. Anterior lobe of pronotum nari'ower than the head exclusive of 

 the eyes, the posterior lobe abruptly expanded. 



paraiiensis Buna. 

 bb. Anterior lobe of pronotum not narrower than the head exclusive 

 of the eyes, the posterior lobe gradually' and regularly expand- 

 ing behind, 

 c. Markings on apical half of tegmina composed of longitudinal 

 streaks l)y the more or less interrupted infuscation of the lon- 

 gitudinal veins. pallens Thunl). 

 cc. Markings on apical half of tegmina composed of fuscous spots 

 arranged in ol>liquely transverse series. cancellata Serv. 



Fig. 31. — ScJiistocerca paranensis — a dwarfed female specimen. 



S. florofitschifd DeGeer. Throughout the valley of the Rio 

 Parana, but nowhere numerous. 



*S'. jjaroiiensis Burm. The destructive locust of the countr\^ 

 and represented in all the collections. 



S. pdlleus Thunb. Several specimens of this more northern 

 locust were observed along- the upper Parana between Cor- 

 rientes and Formosa. 



S. vam-ellafa Serv. Buenos Air(>s, Rosario, Santa Fe, 

 Carcarana, etc. Quite a number of sp(>cimens of this species 

 were examined during the writer's sojourn in the country. As 

 will be seen by an examination of the accompanying illustra- 

 tions, there is quite a resemblance in the general a])pearance 

 of this and the p(ir(nie)isis imagos; but the saltonas are C[uite 

 different. The viotcelldid som'^tiuies accompanies the 



